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ctr_drbg: add comments relating the code with the NIST specification

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Gilles Peskine 2018-08-03 20:16:52 +02:00 • committed by Nir Sonnenschein
parent 954f9879e9
commit ed7da59798
2 changed files with 74 additions and 6 deletions
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17
tests/suites/test_suite_ctr_drbg.function
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@ -62,12 +62,15 @@ void ctr_drbg_validate_pr( data_t * add_init, data_t * entropy,
test_offset_idx = 0;
TEST_ASSERT( mbedtls_ctr_drbg_seed_entropy_len( &ctx, mbedtls_test_entropy_func, entropy->x, add_init->x, add_init->len, 32 ) == 0 );
/* CTR_DRBG_Instantiate(entropy[:entropy_len/3], nonce, perso, <ignored>)
* where nonce||perso = add_init[add_init_len] */
mbedtls_ctr_drbg_set_prediction_resistance( &ctx, MBEDTLS_CTR_DRBG_PR_ON );
TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx, buf, 16, add1->x, add1->len ) == 0 );
TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx, buf, 16, add2->x, add2->len ) == 0 );
/* CTR_DRBG_Generate(result_len * 8 bits, add1[:add1_len]) -> buf */
/* Then reseed because of prediction resistance. */
TEST_ASSERT( hexcmp( buf, result_str->x, 16, result_str->len ) == 0 );
/* CTR_DRBG_Generate(result_len * 8 bits, add2[:add2_len]) -> buf */
/* Then reseed because of prediction resistance. */
exit:
mbedtls_ctr_drbg_free( &ctx );
@ -86,12 +89,14 @@ void ctr_drbg_validate_nopr( data_t * add_init, data_t * entropy,
test_offset_idx = 0;
TEST_ASSERT( mbedtls_ctr_drbg_seed_entropy_len( &ctx, mbedtls_test_entropy_func, entropy->x, add_init->x, add_init->len, 32 ) == 0 );
/* CTR_DRBG_Instantiate(entropy[:entropy_len/2], nonce, perso, <ignored>)
* where nonce||perso = add_init[add_init_len] */
TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx, buf, 16, add1->x, add1->len ) == 0 );
/* CTR_DRBG_Generate(16 * 8 bits, add1[:add1_len]) -> buf */
TEST_ASSERT( mbedtls_ctr_drbg_reseed( &ctx, add_reseed->x, add_reseed->len ) == 0 );
TEST_ASSERT( mbedtls_ctr_drbg_random_with_add( &ctx, buf, 16, add2->x, add2->len ) == 0 );
/* CTR_DRBG_Reseed(entropy[entropy_len/2:entropy_len], add_reseed[:add_reseed_len]) */
TEST_ASSERT( hexcmp( buf, result_str->x, 16, result_str->len ) == 0 );
/* CTR_DRBG_Generate(16 * 8 bits, add2[:add2_len]) -> buf */
exit:
mbedtls_ctr_drbg_free( &ctx );